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University of Washington police are investigating a sexual assault that occurred Monday in a campus residence hall.

The victim was walking to her room in a residence hall in the northeast section of campus when someone came up from behind her as she opened the door, according to UW police. The man followed her into her room and assaulted her, police said.

Police say they are not identifying the residence hall out of safety and privacy concerns for the victim.

Police said the victim does not know the attacker. He was in his late teens to early 20s, about 6-feet-1 with a medium build and a thin mustache, police said. He was wearing a hoodie and sunglasses.